Filament spool



FIG. 1 is a perspective view, taken from the front, top, and left of a filament spool showing our new design;

FIG. 2 is a perspective back view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a right side elevational view thereof, the left side being a mirror image of the right side;

FIG. 6 is a front elevational view thereof, having a section line 8-8 indicated thereon;

FIG. 7 is a rear elevational view thereof, having a section line 9-9 indicated thereon;

FIG. 8 is a sectional view thereof, taken along line 8-8 of FIG. 6;

FIG. 9 is a sectional view thereof, taken along line 9-9 of FIG. 7, and having a line 7-7 indicated thereon; and,

FIG. 10 is a sectional view thereof taken along line 7-7 of FIG. 9. 

CLAIM The ornamental design for a filament spool, as shown. 